Place cast iron grill over medium heat or heat up your outside grill over medium.
Combine the minced garlic and butter in a small bowl and spread on both sides of the slices of bread.
Drizzle eggplant with olive oil and sprinkle with some salt and pepper.
Place the pieces of bread and two slices of eggplant on the grill. Eggplant will need 2 mins per side, take off and set aside. The bread will need 3-4 mins per side. (If using a small cast iron grill inside, first grill the eggplant, set aside and then move onto the bread).
Once the first side of the bread is brown, flip and sprinkle mozzarella cheese. Cover and let melt for 3-4 minutes.
Build your melt, place eggplant on top of piece of bread, then place the tomatoes on top of the eggplant, drizzle with olive oil and sprinkle with salt and pepper. Enjoy!:)